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Commitments and Contingencies - Narrative (Details) - USD ($) | 1 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
May 31, 2018 | Dec. 31, 2018 | Dec. 31, 2017 | Feb. 28, 2018 | Aug. 31, 2012
Operating Leased Assets [Line Items] |  |  |  |  |
Rent expense |  | $ 1,200,000 | $ 1,000,000 |  |
Purchase commitments related to inventory |  | 200,000 | $ 100,000 |  |
San Jose, California |  |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |  |
Non-cancelable operating lease term |  |  |  |  | 4 years
Early termination fees | $ 0 |  |  |  |
Santa Clara, California |  |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |  |
Non-cancelable operating lease term |  |  |  | 7 years |
Indemnification Agreement |  |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |  |
Costs to defend lawsuits or settle claims |  | 0 |  |  |
Costs accrued to defend lawsuits |  | $ 0 |  |  |

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- Definition Gain (loss) related to the termination of a contract between the parties. The termination may be due to many causes including early termination of a lease by a lessee, a breach of contract by one party, or a failure to perform. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 + Details
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- Definition Term of lessee's operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918673-209980 + Details
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- Definition Rental expense for the reporting period incurred under operating leases, including minimum and any contingent rent expense, net of related sublease income. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=77902758&loc=d3e41499-112717 + Details
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